Case Study

Cullverlands Farm GSHP installed for future capacity 

With this case study, isoenergy updated this stunning country estate with a renewable energy system for future capacity. 

Case study: Cullverlands Farm GSHP installed for future capacity.


Property type: Country estate 
Technologies installed: Heat pump  
Collector type: Ground loops 
New/retrofit: Retrofit   

The recommended solution:   

isoenergy was approached by the new owners of Cullverlands Farm in Berkshire to design and install a ground source heat pump installation. The brief was to provide a complete heating and hot water solution for the existing farmhouse, which was being renovated, and a large, new build extension to be added once planning had been approved. 

Key features:   

  • 22kW ground source heat pump system 
  • 5 x 125m collector loop horizontal trenches 
  • 800 litre hot water tank 
  • 300 litre buffer tank 


Having reviewed the site and liaised with the architect regarding the future extension, isoenergy specified a 22kW ground source heat pump connected to an 800L hot water cylinder and 300L heating buffer tank to cover the loads on site. In the adjoining paddock, we laid five 250m horizontal collector loops in five 125m trenches excavated by the main contractor.

As the client upgraded to a three-phase supply to accommodate the future extension and car-charging points, isoenergy specified a three-phase heat pump that could be balanced across the incoming supply. 

As the plant room was situated remotely from the main house, isoenergy determined and installed two pre-insulated pipes buried in a trench, which linked the two buildings together. 

Installing a ground source heat pump has significantly reduced both the running costs and carbon emissions whilst also future-proofing the building against changes to legislation around domestic heating.